EP0670524B1 - Elektrophotographische Photoleiter - Google Patents

Elektrophotographische Photoleiter Download PDF

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Publication number
EP0670524B1
EP0670524B1 EP95102536A EP95102536A EP0670524B1 EP 0670524 B1 EP0670524 B1 EP 0670524B1 EP 95102536 A EP95102536 A EP 95102536A EP 95102536 A EP95102536 A EP 95102536A EP 0670524 B1 EP0670524 B1 EP 0670524B1
Authority
EP
European Patent Office
Prior art keywords
charge
intermediate layer
layer
substrate
electrophotographic photoconductor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP95102536A
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English (en)
French (fr)
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EP0670524A1 (de
EP0670524B2 (de
Inventor
Koichi C/O Fuji Electric Co. Ltd Aizawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fuji Electric Co Ltd
Original Assignee
Fuji Electric Co Ltd
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Application filed by Fuji Electric Co Ltd filed Critical Fuji Electric Co Ltd
Publication of EP0670524A1 publication Critical patent/EP0670524A1/de
Publication of EP0670524B1 publication Critical patent/EP0670524B1/de
Application granted granted Critical
Publication of EP0670524B2 publication Critical patent/EP0670524B2/de
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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G5/00—Recording-members for original recording by exposure, e.g. to light, to heat or to electrons; Manufacture thereof; Selection of materials therefor
    • G03G5/10—Bases for charge-receiving or other layers
    • G03G5/102—Bases for charge-receiving or other layers consisting of or comprising metals
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G5/00—Recording-members for original recording by exposure, e.g. to light, to heat or to electrons; Manufacture thereof; Selection of materials therefor
    • G03G5/14—Inert intermediate or cover layers for charge-receiving layers
    • G03G5/142—Inert intermediate layers

Definitions

  • the present invention relates to an organic electrophotographic photoconductor in the type of having functionally distinguished laminate layers.
  • organic electrophotographic photoconductors in the type of having functionally distinguished organic laminate layers, a charge-generation layer and a charge-transport layer which are applied on an electroconductive substrate in that order, have been developed and provided in practical uses.
  • the electrophotographic photoconductor is formed by the process including steps of: preparing a solution by dissolving and dispersing an organic charge-generation material and a resin binder in an organic solvent; applying the solution on a surface of an electroconductive substrate made of an aluminum alloy and drying the solution to provide a charge-generation layer; preparing another solution by dissolving and dispersing an organic charge-transport material and a resin binder in an organic solvent; applying the solution on a surface of the charge-generation layer and drying the solution to provide a charge-transport layer.
  • the charge-transport layer may include an additive such as an antioxidant.
  • the conventional organic electrophotographic photoconductor may readily cause some troubles, for example image deterioration such as a light gray appearance in non-image areas and a blank unprinted appearance in image areas in a copy formed by a copying machine of a positive development type.
  • image deterioration such as a light gray appearance in non-image areas and a blank unprinted appearance in image areas in a copy formed by a copying machine of a positive development type.
  • printing defections such as black dots in non-image areas and lowering of printing concentration under a repetitive printing process may be also observed in a copy formed by an electrophotocopying machine of a negative development type, such as a laser printer.
  • a surface of the electroconductive substrate is shaved with a diamond tool or the like and then the shaved surface is ground to a predetermined surface roughness by means of grinding or the like.
  • machine oil, grinding oil, and other unnecessary materials are removed from the surface of the substrate by treating with a cleaning agent.
  • the intermediate layer, the charge-generation layer, and the charge-transport layer are applied on the substrate in that order.
  • an appropriate organic base solvent such as trichloroethylene and Freon® has been used as the above cleaning agent,
  • the organic base solvents are now regarded as industrial pollutants that deplete the ozone layer.
  • the electroconductive substrate of aluminum alloy can be easily etched by the water-soluble detergent such as the weak alkali.
  • the aluminum alloy comprises an area to be easily etched by the detergent. That is, the aluminum alloy usually comprises an element such as iron that has a higher oxidation-reduction potential compared with that of aluminum, so that for example an iron-rich portion and its surroundings formed in the aluminum alloy can be more easily etched than the other portions.
  • an etched-pit with a diameter of in the order of 1 x 10 -1 to 3 x 10 -1 can be sometimes formed in the electroconductive substrate.
  • a surface level of the substrate becomes uneven after being subjected in the washing step.
  • a part of the intermediate layer to be applied thereon also becomes thicker while another part thereof becomes thinner.
  • a local leak of electrons can be observed in its relatively thin portion, resulting in an defective image with a whiteness, an unexpected black dot, or the like.
  • This kind of phenomena may be not observed at the beginning but it will be actualized with the accumulation of electrons after repeating image formations (for example forming images on 10,000 sheets of A-4 sized paper).
  • a residual potential is increased by the accumulated electrons and thus the image to be formed can be polluted or degraded.
  • an electrophotographic photoconductor comprising an electroconductive substrate, an intermediate layer formed on said electroconductive substrate, a charge-generating layer formed on said intermediate layer and a charge-transport layer formed on said charge generating layer.
  • Said intermediate layer comprises a copolymerized nylon resin having a layer thickness of 1 ⁇ m.
  • JP-A-61-219046 there is known an electrophotographic photoconductor of which the electroconductive substrate may consist of aluminum, aluminum alloy, copper, stainless steel or the like.
  • JP-A-32-00973 discloses an electrophotographic photoconductor wherein an aluminum alloy material is used for the electroconductive substrate.
  • FR-A-2642189 discloses electrophotographic photoconductors of various compositions.
  • JP-64-86152 discloses an organic electrophotographic conductor comprising a substrate and a photosensitive layer.
  • said substrate consists of an aluminum alloy with an iron content of 0.01 to 0.40 percent by weight and a silicon content of 0.05 to 0.25 percent by weight.
  • Said conventional photoconductor comprises an intermediate layer having a dry thickness of about 0.4 microns.
  • An object of the present invention is to provide an organic electrophotographic photoconductor to be used for forming excellent images not only in early stages of repetitive printing but also in through stages thereof in spite of after subjecting the electroconductive substrate in the process including the step of treating with an organic base solvent such as trichloroethylene and Freon® as a cleaning agent.
  • an organic base solvent such as trichloroethylene and Freon® as a cleaning agent.
  • the intermediate layer mainly comprises an alcohol-soluble polyamide resin with a thickness of 0.5 ⁇ m or more, or more preferably with a thickness in the range of 0.5 ⁇ m to 3.0 ⁇ m.
  • Fig. 1 is a schematic cross-sectional view of one of the preferred embodiments of the electrophotographic photoconductor in accordance with the present invention.
  • Fig. 1 is a schematic cross-sectional view of one of the preferred embodiments of the electrophotographic photoconductor in accordance with the present invention.
  • the photoconductor is composed of an electroconductive substrate 1, an intermediate layer 2, a charge generation layer 3, and a charge transport layer 4. As shown in the figure, the layers 2, 3, and 4 are applied on the substrate 1 in that order.
  • the electroconductive substrate 1 is made of an aluminum alloy.
  • the aluminum alloy is in the type of containing 0.1 % by weight or less of iron.
  • JIS Japanese Industry Standard
  • a water-soluble detergent such as a water-soluble weak-alkali detergent, for example NF-10 (Lion Co., Ltd.
  • the intermediate layer 2 of the present invention is formed as a coating film mainly comprising an alcohol-soluble polyamide resin, with a thickness of 0.5 ⁇ m or more, or preferably with a thickness in the range of 0.5 ⁇ m to 3.0 ⁇ m.
  • the charge generation layer 3 is formed as a coating film of a mixture of an organic charge-generation substance and a resin binder.
  • the charge-generation substance should be selected from appropriate substances in accordance with the wavelength of the exposure light to be used in the process of image formation, for example it can be selected from a group of phtalocyanine compounds.
  • Non-metallic phthalocyanine can be preferably used in the case of using a semiconductor laser beam as a light source of the exposure.
  • the resin binder can be preferably selected from a group of polycarbonate, polyester, polyamide, polyurethane, epoxy resin, methacrylate homo- and co-polyesters, silicone resin, vinyl chloride, vinyl chloride/vinyl acetate copolymer, poly-vinyl butylal, polyvinyl acetate, poly-vinyl alcohol, and mixture thereof.
  • the charge transport layer 4 is formed as a coating film comprising: at least one organic charge transfer substance such as polyvinyl carbazole, oxaziazole, imidazole, hydrazone, pyrazoline, and stilbene; and a resin binder. Also, the coating film may optionally comprise anti-oxidizing agent, a UV absorber, or the like.
  • An electrophotographic photoconductor was prepared as follows.
  • a conductive substrate (Sample 1) having a finished surface roughness (Rmax) of 0.5 ⁇ m was formed by grinding an outer surface of a cylindrical tube by a diamond tool.
  • the cylindrical tube (30 mm in outside diameter and 250 mm in length) was made of an aluminum alloy consisting of the elements shown in Table 1.
  • Table 1 A composition of the aluminum alloy of Sample 1 Content (% by weight) Si 0.04 Fe 0.02 Cu - Mn - Mg 0.48 Cr - Zr - Ti - Al remains
  • the conductive substrate For cleaning a surface of the conductive substrate, it was suspended in a solution of 5 % weak-alkali soluble detergent (trade name "NF-10", Lion Co., Ltd.) for 3 minutes at 50 °C and subjected to ultrasonic-cleaning. Then the cleaned substrate was subjected to brush-cleaning in a solution of 5% weak-alkali soluble detergent. After the cleaning, the conductive substrate was washed by a series of tap water (with ultrasonic for 3 min.); pure water (with ultrasonic for 3 min.); and extra pure water (with ultrasonic for 3 min.), and then dried by hot pure water at 70 °C.
  • 5 % weak-alkali soluble detergent trade name "NF-10", Lion Co., Ltd.
  • the conductive substrate was immersed in a coating solution to form an intermediate layer of 0.8 ⁇ m in thickness on its surface.
  • the coating solution was prepared by dispersing 5 part by weight of alcohol-soluble nylon known by the trade name "CM8000" (Toray Industries Co., Ltd.) into 95 part by weight of methanol.
  • the conductive substrate was immersed in a coating solution to form a charge-generation layer of 0.1 ⁇ m in thickness on the surface of the intermediate layer.
  • the coating solution was prepared by dispersing X-type non-metallic phthalocyanine (1 part by weight) and polyvinyl butyral (1 part by weight) in tetrahydrofuran (98 part by weight).
  • a charge transport layer of 20 ⁇ m in thickness was also formed on the charge generation layer of the conductive substrate by immersing the substrate in a coating solution comprising:
  • photoconductor No. 1 an electrophotographic photoconductor (hereinafter referred to as photoconductor No. 1) was obtained.
  • the photoconductor No. 1 showed its excellent photosensitivities under the light beam (780 nm in wavelength) of semiconductor laser because the energy of its half-decay exposure is about 0.4 ⁇ J/cm 2 .
  • the photoconductor No. 1 was installed in a commercially available laser beam printer known as the trade name "NEC PR-1000" (Nippon electric Co., Ltd.).
  • the image quality of each copy was estimated by measuring light intensities at a printed area and an non-printed area of each copy as a printing concentration and a blank concentration respectively, by a Macbeth illuminometer.
  • the printer provided excellent images with the printing concentration of 1.40, the blank concentration of 0.07; and four black dots (at least 0.1 mm in diameter) per an area of the copy printed by one rotation of the photoconductor No. 1 during the printing process.
  • the image qualities were also tested by means of Macbeth illuminometer.
  • the printer also provided excellent images with the print concentration of 1.40; the blank concentration of 0.08; and five undesired black dots (at least 0.1 mm in diameter) per an area of the copy printed by one rotation of the photoconductor No. 1 during the printing process. Consequently, there was no difference between the image qualities of the above two stages.
  • Conductive substrates were prepared by the same way as that of Example 1 except that the compositions listed in the following table were used.
  • electrophotographic photoconductors Nos. 2-5 and comparative Example 1 were prepared by using the conductive substrates (Samples 2-6), respectively, and tested by the same way as that of Example 1.
  • the obtained images showed the excellent image qualities as well as Example 1 in both early and extended periods (i.e., before and after running tests).
  • the electrophotographic photoconductor of Comp. Ex. 1 using the conductive substrate of sample 6 on the other hand, the image qualities were decreased throughout the extended period.
  • the electrophotographic photoconductor of Comp. Ex. 1 provides the excellent image qualities as well as the other photoconductors in the early periods of use, it provides poor image qualities after the running test. That is, one hundred of the undesirable black dots were detected in the non-imaged area of the copy after the running test, which were 20 times greater than that of the early periods of use. As a result, the electrophotographic photoconductor of Comp. Ex. 1 had poor image qualities to be practical.
  • each substrate was made of the aluminum alloy having the same composition as that of Sample 5 described above, on which an intermediate layer, a charge-generation layer, and a charge-transport layer were applied in that order to form an electrophotographic photoconductor,
  • the photoconductors No. 6 to 9 and comparative Examples 2 and 3 were prepared so as to have different intermediate layer's thickness, respectively, and subjected to the running test of Example 1. The obtained results were listed in Table 3.
  • Table 3 No. thickness ( ⁇ m) sensitivity ( ⁇ J/cm 2 ) black dots (number) image quality Comp. Ex. 2 0.1 0.3 100 X Comp. Ex. 3 0.3 0.3 30 ⁇ Comp. Ex. 6 0.5 0.4 5 ⁇ Comp. Ex. 7 0.8 0.4 5 ⁇ Comp. Ex. 8 1.2 0.5 4 ⁇ Comp. Ex. 9 2.0 0.5 5 ⁇
  • the number of undesired black dots increased with decreasing the thickness of the intermediate layer for example the layer of 0.3 ⁇ m in thickness has a small number of the black dots compared with that of the layer of 0.1 ⁇ m in thickness. Consequently, the thickness of the intermediate layer is 0.5 ⁇ m or more.
  • the sensitivity of the photoconductor could not be decreased significantly when the thickness of the intermediate layer was up to 2 ⁇ m. In this case, there were no troubles found in the image so that both printing concentration and blank concentration were excellent.
  • an electrophotographic photoconductor of the present invention shows excellent photosensitivities and excellent properties of providing good image qualities without causing troubles.
  • the electrophotographic photoconductor of the present invention comprises a conductive substrate on which an intermediate layer, a charge-generation layer, and a charge transport layer are formed in that order.
  • the conductive substrate is made of aluminum alloy with the iron content of 0.1 % by weight or less and the intermediate layer is made of an alcohol-soluble polyamide layer of 0.5 ⁇ m or more in thickness.
  • the organic electrophotographic photoconductor keeps its excellent photosensitivities and image-forming abilities to constantly provide images of high qualities in spite of in early or late stages of repeating the cycle of image formation. Furthermore, these excellent characteristics are not affected by the process of washing the electroconductive substrate before forming the intermediate layer thereon. That is, the conductive substrate can be subjected to the wet-washing process using a soluble detergent such as weak-alkali detergent without causing any troubles. Therefore, there is no need to use organic base solvent such as trichloroethylene and Freon® which are regarded as industrial pollutants that deplete the ozone layer. Thus the electrophotographic photoconductor of the present invention meets the demand of environmental protection.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Photoreceptors In Electrophotography (AREA)

Claims (2)

  1. Organischer, elektrofotografischer Fotoleiter, der umfasst:
    ein elektrisch leitendes Substrat, das aus einer Aluminiumlegierung besteht, eine Zwischenschicht, die auf dem elektrisch leitenden Substrat ausgebildet ist, wobei die Zwischenschicht hauptsächlich ein alkohollösliches Polyamidharz umfasst, eine Ladungserzeugungsschicht, die auf der Zwischenschicht ausgebildet ist; und eine Ladungstransportschicht, die auf der Ladungserzeugungsschicht ausgebildet ist,
    dadurch gekennzeichnet, dass
    das elektrisch leitende Substrat einen Eisengehalt von 0,1 Gew.-% oder weniger hat, und dass die Zwischenschicht eine Dicke von 0,5 µm oder mehr hat.
  2. Organischer, elektrofotografischer Fotoleiter nach Anspruch 1,
    dadurch gekennzeichnet, dass
    die Zwischenschicht eine Dicke im Bereich von 0,5 µm bis 3,0 µm hat.
EP95102536A 1994-02-23 1995-02-22 Elektrophotographische Photoleiter Expired - Lifetime EP0670524B2 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP24633/94 1994-02-23
JP2463394 1994-02-23
JP02463394A JP3258163B2 (ja) 1994-02-23 1994-02-23 電子写真感光体

Publications (3)

Publication Number Publication Date
EP0670524A1 EP0670524A1 (de) 1995-09-06
EP0670524B1 true EP0670524B1 (de) 2001-09-19
EP0670524B2 EP0670524B2 (de) 2009-04-01

Family

ID=12143541

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95102536A Expired - Lifetime EP0670524B2 (de) 1994-02-23 1995-02-22 Elektrophotographische Photoleiter

Country Status (5)

Country Link
US (1) US5554472A (de)
EP (1) EP0670524B2 (de)
JP (1) JP3258163B2 (de)
CA (1) CA2143154C (de)
DE (1) DE69522727T3 (de)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004095144A1 (ja) * 2003-04-24 2004-11-04 Sharp Kabushiki Kaisha 電子写真感光体、電子写真画像形成方法および電子写真装置
JP2007058110A (ja) 2005-08-26 2007-03-08 Fuji Electric Device Technology Co Ltd 電子写真感光体の製造方法および電子写真感光体
US20100314885A1 (en) * 2007-03-23 2010-12-16 Flodesign Wind Turbine Corporation Shrouded wind turbine with rim generator and halbach array
US20100316493A1 (en) * 2007-03-23 2010-12-16 Flodesign Wind Turbine Corporation Turbine with mixers and ejectors
US8573933B2 (en) * 2007-03-23 2013-11-05 Flodesign Wind Turbine Corp. Segmented wind turbine
US20110027067A1 (en) * 2007-03-23 2011-02-03 Flodesign Wind Turbine Corporation Coated shrouded wind turbine
US20110014038A1 (en) * 2007-03-23 2011-01-20 Flodesign Wind Turbine Corporation Wind turbine with skeleton-and-skin structure
US8021100B2 (en) * 2007-03-23 2011-09-20 Flodesign Wind Turbine Corporation Wind turbine with mixers and ejectors
US20110020107A1 (en) * 2007-03-23 2011-01-27 Flodesign Wind Turbine Corporation Molded wind turbine shroud segments and constructions for shrouds
US20100028132A2 (en) * 2007-03-23 2010-02-04 Flodesign Wind Turbine Corporation Wind turbine with mixers and ejectors
US8622688B2 (en) * 2007-03-23 2014-01-07 Flodesign Wind Turbine Corp. Fluid turbine
US20090230691A1 (en) * 2007-03-23 2009-09-17 Presz Jr Walter M Wind turbine with mixers and ejectors
US8657572B2 (en) 2007-03-23 2014-02-25 Flodesign Wind Turbine Corp. Nacelle configurations for a shrouded wind turbine

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JPS61219046A (ja) * 1985-03-26 1986-09-29 Canon Inc 積層型電子写真感光体
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JPH0693129B2 (ja) * 1989-01-21 1994-11-16 キヤノン株式会社 電子写真感光体
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EP0576957B1 (de) * 1992-06-22 2000-09-06 Sharp Kabushiki Kaisha Elektrophotographischer Photoleiter und dessen Herstellungsverfahren

Also Published As

Publication number Publication date
US5554472A (en) 1996-09-10
CA2143154C (en) 2006-08-01
DE69522727T3 (de) 2009-07-23
JP3258163B2 (ja) 2002-02-18
EP0670524A1 (de) 1995-09-06
DE69522727D1 (de) 2001-10-25
CA2143154A1 (en) 1995-08-24
DE69522727T2 (de) 2002-05-29
JPH07234531A (ja) 1995-09-05
EP0670524B2 (de) 2009-04-01

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